The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A giant Troll lurks under one of Seattle's oldest bridges.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The first American axe throwing club.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The land is home to swimming ponies and a legendary 18th-century treasure.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

Rare recess caves fill this unbelievably beautiful Ohio park.

Mysterious rocks that ring musically when struck.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The oldest farmer's market in America is so ancient it was approved by the King of England.

In this cemetery stands the country's first public crematorium.

The first of Lancaster's "rural cemeteries."

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

One of the oldest Catholic churches in the U.S., situated just east of Gettysburg.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

Home of the only civilian casualty at the Battle of Gettysburg.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.